Labour MP Simon Danczuk, who reportedly sent explicit text messages to a 17-year-old girl, is under mounting pressure to resign after protesters descended on his Rochdale constituency office on Monday.

The 49-year-old, who is at the heart of a deepening sexting scandal, admitted he was “silly” for sending explicit text messages to the 17-year-old dominatrix, who had asked him for a job.

In a string of lewd messages, the MP told Sophena Houlihan how “horny” he was and asked her if she wanted “spanking.”

Today's Sun story, while not entirely accurate, refers to an extremely low point in my life

Following the publication of an investigation by The Sun newspaper, which exposed the allegations last week, the Labour Party suspended Danczuk, a right-winger who has said frequently that socialist Jeremy Corbyn should not be Labour leader, came to prominence by promoting himself as a campaigner against child sex abuse.

Days after the controversy broke, the MP’s ex-wife Sonia Rossington, 39, claimed he bullied her into “awful sex” while she was asleep.

Danczuk dismissed the allegations, claiming Rossington was “consumed by bitterness.”

On Monday, a group of protesters blocked the entrance to Danczuk’s office and called on him to quit.

This is the scene outside Simon Danczuk's office at the minute as residents protest for his resignation pic.twitter.com/p6ccHUDKc2

“If he was a schoolteacher would that be allowed, or if he was a social worker? Would the fact that I was drunk be an excuse? If you go up in court accused of a crime, would the fact that you were drunk excuse you? That can’t be acceptable,” she told The Telegraph.

Commenting on the controversy, Corbyn told The Daily Mirror: “Simon has now been suspended and is being investigated.”